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120 lines
4.2 KiB
Python
120 lines
4.2 KiB
Python
"""
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IPTC metadata parser (can be found in a JPEG picture for example)
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Sources:
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- Image-MetaData Perl module:
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http://www.annocpan.org/~BETTELLI/Image-MetaData-JPEG-0.15/...
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...lib/Image/MetaData/JPEG/TagLists.pod
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- IPTC tag name and description:
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http://peccatte.karefil.com/software/IPTCTableau.pdf
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Author: Victor Stinner
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"""
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from hachoir.field import (FieldSet, ParserError,
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UInt8, UInt16, String, RawBytes, NullBytes)
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from hachoir.core.text_handler import textHandler, hexadecimal
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def IPTC_String(parent, name, desc=None):
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# Charset may be utf-8, ISO-8859-1, or ...
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return String(parent, name, parent["size"].value, desc,
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strip=" ")
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dataset1 = {
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}
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dataset2 = {
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0: ("record_version", "Record version (2 for JPEG)", UInt16),
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5: ("obj_name", "Object name", None),
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7: ("edit_stat", "Edit status", None),
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10: ("urgency", "Urgency", UInt8),
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15: ("category[]", "Category", None),
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22: ("fixture", "Fixture identifier", IPTC_String),
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25: ("keyword[]", "Keywords", IPTC_String),
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30: ("release_date", "Release date", IPTC_String),
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35: ("release_time", "Release time", IPTC_String),
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40: ("instruction", "Special instructions", IPTC_String),
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55: ("date_created", "Date created", IPTC_String),
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60: ("time_created", "Time created (ISO 8601)", IPTC_String),
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65: ("originating_prog", "Originating program", IPTC_String),
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70: ("prog_ver", "Program version", IPTC_String),
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80: ("author", "By-line (Author)", IPTC_String),
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85: ("author_job", "By-line (Author precision)", IPTC_String),
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90: ("city", "City", IPTC_String),
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95: ("state", "Province / State", IPTC_String),
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100: ("country_code", "Country / Primary location code", IPTC_String),
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101: ("country_name", "Country / Primary location name", IPTC_String),
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103: ("trans_ref", "Original transmission reference", IPTC_String),
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105: ("headline", "Headline", IPTC_String),
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110: ("credit", "Credit", IPTC_String),
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115: ("source", "Source", IPTC_String),
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116: ("copyright", "Copyright notice", IPTC_String),
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120: ("caption", "Caption/Abstract", IPTC_String),
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122: ("writer", "Writer/editor", IPTC_String),
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231: ("history[]", "Document history (timestamp)", IPTC_String)
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}
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datasets = {1: dataset1, 2: dataset2}
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class IPTC_Size(FieldSet):
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def __init__(self, *args, **kw):
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FieldSet.__init__(self, *args, **kw)
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value = 0
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for field in self:
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value <<= 15
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value += (field.value & 0x7fff)
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self.createValue = lambda: value
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def createFields(self):
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while True:
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field = UInt16(self, "value[]")
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yield field
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if field.value < 0x8000:
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break
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class IPTC_Chunk(FieldSet):
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def __init__(self, *args, **kw):
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FieldSet.__init__(self, *args, **kw)
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number = self["dataset_nb"].value
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self.dataset_info = None
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if number in datasets:
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tag = self["tag"].value
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if tag in datasets[number]:
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self.dataset_info = datasets[number][tag]
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self._name = self.dataset_info[0]
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self._description = self.dataset_info[1]
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size_chunk = self["size"]
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self._size = 3 * 8 + size_chunk.size + size_chunk.value * 8
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def createFields(self):
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yield textHandler(UInt8(self, "signature", "IPTC signature (0x1c)"), hexadecimal)
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if self["signature"].value != 0x1C:
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raise ParserError("Wrong IPTC signature")
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yield textHandler(UInt8(self, "dataset_nb", "Dataset number"), hexadecimal)
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yield UInt8(self, "tag", "Tag")
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yield IPTC_Size(self, "size", "Content size")
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size = self["size"].value
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if 0 < size:
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if self.dataset_info:
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cls = self.dataset_info[2]
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else:
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cls = None
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if cls:
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yield cls(self, "content")
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else:
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yield RawBytes(self, "content", size)
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class IPTC(FieldSet):
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def createFields(self):
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while 5 <= (self._size - self.current_size) // 8:
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yield IPTC_Chunk(self, "chunk[]")
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size = (self._size - self.current_size) // 8
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if 0 < size:
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yield NullBytes(self, "padding", size)
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